Control means for motor-driven devices



May 27, 1930.

R. G. LOCKETT 1,760,600

CONTROL MEANS FOR MOTOR DRIVEN DEVICES Filed Dec. 25, 1927 2Sheets-Sheet 1 @Xgl O as L mg J I 30 z7 2| 0 2e QE INVENTOR.

WOKY'MW MW ATTORNEY.

R. G. LOCKETT lfiOfiO CONTROL MEANS FOR MOTOR DRIVEN DEVICES Filed Dec.23, 1927 2 Sheets-Sheet 2 2M 13 I r0 0 INVENTOR.

A TTORNEY.

Patented May 27, 1930 UNITED STATES PATENT o F1cE RALPH G. LOCKETT, OFWAUWATOSA, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CUTLER-HAMMER,INC., A CORPORATION OF DELAWARE CONTROL MEANS FOR MOTOR-DRIVEN DEVICESApplication filed December 23, 1927. Serial No. 242,147.

This invention relates to improvements in control means for motor drivendevices, and more particularly to improvements in control means forwashing machines of the multiple 5 compartment type referred to in myPatent N 0. 1,638,861, dated August 16, 1927.

' An object of the invention is to provide improved and simplifiedcontrol means of the aforementioned character.

Another obiect is to provide novel control means including means forinsuring ability to complete the motor circuit for inching after theprime stop or any subsequent stop, irrespective of the position of anyof the limit switches employed.

Another object is to provide such control means utilizing a continuouslyoperating power driven member for communicating the motor circuitconnections under given conditions, whereby a single driving means maybe employed in conjunction with any desired number of commutatingmembers.

Another object is to provide control means of the aforementionedcharacter including 2 means for effecting the prime stop and eachsubsequent stop of the driven member underinsured conditions ofunidirectional operation of the latter, said means including means foreffecting stopping of the driving motor by plugging.

Another and more specific object is to provide means normally biased toa position to render ineffective certain of the limit switches employed,said means being responsive to a given speed and direction of operationof the driving motor to thereupon render such limit switches efiective.I

Other objects and advantages of the invention will hereinafted appear.

The accompanying drawings illustrate an embodiment of the inventionwhich will now be described, it being understood that the embodimentillustrated is susceptible of modification in the details ofconstruction and op eration thereof without departing from the scope ofthe appended claims.

In the drawings, Figure 1 illustrates schematically and diagrammaticallya controller embodying the present invention, and

Fig. 2 is an across-the-line diagram of the circuit conections for thecontroller illustratdesignates the cylinder of a washing machine of asuitable or well known construction,-- said cylinder (as shown in dottedlines) having a plurality of partition walls forming compartments 10, 10and 10, each compartment being provided with the usual opening and amovable closure therefor as indicated at 10, respectively. Cylinder 10is rotatable within the usual stationary tub or casing (not shown) bymeansof a reversible motor 11. Said tub is likewise provided with amovable closure or closures with which said compart ment closures areadapted to register under predetermined conditions hereinafter setforth. A multiple compartment washing machine of the general type hereincontemplated is disclosed in my prior Patent No. 1,638,861, dated August16, 1927.

For purposes hereinaftermore fully de-. scribed I provide a pair ofswitches 12 and 13, said switches being associated with the tub doororclosure in such manner that switch 12 is closed and the switch 13 openedwhen the tub door is closed, and upon opening of the tub door switch 12is opened and switch 13 is closed. Switches of the character justreferred to, and means for operating thesame, are disclosed in PatentNo. 1,643,197, dated Sept. 20, 1927, to E. J. Carroll, and furtherdescription thereof herein is deemed unnecessary.

The motor 11 is subj eet to control by the various instrumentalitiesillustrated, including a drum shown diagrammatically at D which iscontinuously rotatable unidirectionally by means of an electric motor 14or other suitable source of power. Drum D is provided with relativelymovable contactors and segments a to 90, inclusive, which co-operatewith the contacts 1* and 1 of a normally open electromagneticallyoperable switch 1M, whereby the circuit of motor 11 is commutated foreffecting operation of the latter alternately in reverse directions.Certain of the contactors and segments of drum D are likewise adapted toprovide for initial inclusion and subsequent exclusion of resistancesections '1", r

and r whereby motor 11 is accelerated after each reversal of operationthereof.

Carried by the shaft 15 or other movable part of drum D is a cam 16 orthe like adapted upon given operative positioning of drum D (whichposition in the present instance corresponds with full speed operationof motor 11 in a predetermined direction) to eifect opening of a set ofnormally closed contacts 17, against the action of aspring 18. Ashereinafter more fully described said contacts 17 co-operate withcontacts 19 of a cam operated limit switch 20 and with the normallyclosed auxiliary contacts 21 of a relay CR to maintain an energizingcircuit for the winding of switch 1M pending simultaneous opening of allof said contacts. Initial energization of the winding of switch 1M isdependent upon closure of a manually operable snap switch 22 and is alsodependent upon closure of switch 12 through closure of the tub door inthe manner aforedescribed, the auxiliary contacts 21 of relay CR beingnormally closed as aforestated.

The normally closed main contacts 2 of switch 2M co-operate with certainof the contactors and segments of drum D to commutate the resistancesectionir Thus assuming energization and closure of switch 1M, theelements thus far described provide for continuous operation of motor 11(and cylinder 10 driven thereby) alternately in reverse directions,theduration of operation of the motor in each direction and the rate ofacceleration of the latter being dependent upon the rate of operation ofthe motor 14 driving drum D.

Stopping of motor 11 is initiated by closure of a normally open pushbutton switch 23, thereby completing an energizing circuit for thewinding of relay CR ,t-he main contacts 24 of the latter thereuponclosing to maintain said energizing circuit independently of push buttonswitch 23. The normally closed auxiliary contacts 21 of said relay arelikewise opened to provide for de-energization of the winding of switch1M upon simultaneous opening 0 contacts 17 and 19,-it being noted thatthe normally open auxiliary contacts 25 of switch 1M are closed'underthe conditions just mentioned. As hereinafter more fully described thearrangement is such that contacts 17 will notbe-opened until the motor11 is operating at substantially full speed in a forward direction,whereas contacts 19 will not be opened until a predetermined one of thecompartments of cylinder 10 is in a given angular relation to the tubdoor. A brake coil B is included in circuit in parallel with the windingof switch 1M through the normally closed auxiliary contacts 26 of arelay CR whereby said coil is energized to release the brake andde-energized to apply the brake simultaneously with the energization andde-energization of said winding of switch 1M.

When rotation of cylinder 10 is stopped in the manner just mentioned thetub door may be opened, thereby effecting opening of switch 12 andclosure of switch 13. Control of operation of the motor 11 is thus transferred from the drum D, switch 1M and contacts 2 of switch 2M to thecontacts 2 and 2 of switch 2M and the contacts 3 and 3 of switch 3M.Energization of the winding of switch 2M is dependent upon closure ofthe normally open main contacts 27 of a relay CR and reclosure of thenormally closed up contacts 28 of a push button switch 29; whereasenergization of the winding of relay CR and closure of the normally openmain contacts 27 and 30 thereof is dependent upon temporary closure ofthe down contacts 31 of push button switch 29, and simultaneous closureof a plurality of cam operated series related switches 32 and 33.

However, in view of the inherent possibility that one of said lastmentioned switches (say switch 32) will be opened and will remain inopen position when the aforementioned prime or initial step of thecylinder is effected, I have provided means for positively insuringability to complete the energizing circuit of the winding of relay CRunder the conditions just mentioned. Said means as shown may comprise apivoted contactor 34 normally biased into engagement with a stationarycontact 35, and operating means for said contactor comprising a magnet36 and a disk 37 of non-magnetic material rotatable with res ect theretoin accordance with the speed 0 motor 11'. Thus upon operation of motor11 in the direction indicated by the arrow (adjacent to the disk 37) inFig. 1 the biasing spring 38 will maintain the contactor 34 inengagement with contact 35 pendin attainment of a predetermined speed ofisk 37 whereupon the magnetic drag effect produced by the rotating diskwill cause pivotal movement of contactor 34 out of engagement withcontact 35 and into engagement with stationary contact 39, for a purposehereinafter described. The aforedescribed device, which ,Iis responsiveto the speed and direction of operation of motor 11, is shown as of thetype disclosed in the Du Bois Patent No. 1,161,932, dated November 30,1915; but it will be understood that any other suitable or equivalentspeed responsive device, such as a fly-ball governor controlled switchor a fluid pressure operated switch, may be substituted therefor.

Also upon closure of the main contacts 30 of relay CR and reclosure ofthe normally closed contacts 28 of push button switch 29 an energizingcircuit for brake coil B is completed. The normally closed auxiliarycontacts 40 of switch 1M and the contact 39 and contactor 34 of thespeed responsive device are included in the energizing circuit of thewinding of each stopping operation of motor 11 (whether from high speedfor the prime stop or from low speed during inching) thus insuringplugging connections for said motor in each instance to assist the brakein effecting accurately positioned stopping of the washer cylinder.

As aforeindicated the contacts 19 of switch 20 are opened only onceduring each revolution of the cylinder 10, such opening of said contactsbeing effected by means of a pro jection 42'on the rotary disk 43.Moreover, in practice the projection 44 on disk 45 will efiect openingof contacts 32 of switch 46 substantially simultaneously with theopening of contacts 19 by said projection 42 on disk 43. Similarly itwill be understood that projections 47 and 48 on disk 45 are eachseparated from the projection 44 by an angle of 120 degrees. The threeprojections 49. 50 and 51 are likewise equally spaced around theperiphery of disk 52 to efi'ect intermittent opening of contacts 33 ofswitch 53. However, each of the projections 49, 50 and 51 on disk 52 isangularly displaced'with reference to the projections 44, 47 and 48,respectively, on disk 45 by an angle of approximately 50 de grees. Itfollows therefore that asingle disk having six projections, withalternate spaces of 50 and degrees therebetween, might be substitutedfor the disks 45 and 52. For prac tical reason, however, it is desirableto employ two disks, such as 45 and 52, with means whereby the angularrelation of the individual projections may be adjusted as desired. Wheresix-position stopping of the cylinder 10 is not required or desired, thethree projections may be removed from one of the disks 45 or 52, or saiddisk itself may be removed from the driving means.

Operation of the controller will now be described with particularreference to thediagram of Fig. 2. Thus assuming that each compartmentof the cylinder 10 has been loaded with goods to be washed or otherwisetreated and each of the compartment doors has been closed. if the snapswitch 22 has been previously closed it is obvious that upon closure ofthe tub door the contacts 12 controlled thereby will closed to completean energizing circuit for the winding of switch 1M. Said circuit may betraced from line L through switch 22 andcontacts 12, conductors 7 0, 71and 72, normally closed auxiliary con-' tacts 21 of relay CR conductor 73 through said winding to line L 5 This efiects closure of the maincontacts 1 and 1 and auxiliary contacts 25 of switch 1M, as well asopening of the auxiliary contacts 40 of the latter. At the same time anenergizing circuit for the brake coil B is completed, said circuitextending from line L to conductor 73 as just traced, conductor 74through the normally closed auxiliary contacts 26 of relay CR and byconductor 7 5 through said brake coil to line L As aforest'ated the drumD (Fig. 1) is rotated continuously in the direction indicated, and hencesaid drum may be in any one of its rotary positions when the contacts 1and 1 of switch 1M are closed.

It may be assumed for purposes of description that drum D is then insuch position that only the groups of drum contactors and segments a, b,0, d and e, f, g, h are engaged, thus effecting connection of motorterminals T T and T with lines L L and L respectively, through theresistances 1' r and 1' whereby operation of motor 11 is started at lowspeed in a forward direction. Continued rotation of drum D willadditionally efi'ect engagement of groups of contactors and segments 0,p; is, Z, m, n, and z', j, thereby short circuiting resistances 1' 1'and r to increase the speed of motor 11. Thereafter all of theaforementioned groups of drum contactors and segments are disengaged andgroups 9, f, r, h and s, b, t, d are brought into engagement to reversethe line connections of terminals T and T of the motor. Reversal ofmotor 11 is thus efi-ected by plugging, with resistances r 1' and rinitially included in the motor circuit. Thereafter engagement of thegroups of drum contactors and segments mt j; is, o, w, n and u, p isefiected, whereb resistances r 1' and r are again short circuited toincrease the motor speed.

The aforedescribed cycle of operation is repeated automatically anydesired number of times pending completion of the-energizing circuit ofthe winding of relay UB through temporary closure of switch 23, While llhave shown switch 23 as of the manually operable push button type; itwill be apparent that any" suitable automatic tiniing means may beemployed to eflect closure of said switch 23 or of an additional switchin parallel with the latter. Assuming closure of push button switch 23,the resulting energizing circuit for the winding of relay CR extendsfrom line- L to conductor 70, thence by conductor 77 through thecontacts of said switch23, conductor 78 through said winding of relay CRto line L Main contacts 24 of relay CR are thereupon closed to maintainsaid energizing circuit by shunting the push button switch 28, saidmaintaining circuit being obvious. At the same time the normally closedauxiliary contacts 21 of relay CR are 0 ened to render the winding ofswitch 1M su ject to de-energization upon simultaneous open positioningof contacts 17 and 19,-auxiliary contacts 25 of switch 1M beingclosed asaforedescribed.

Also it will be remembered that contacts 17 will only be opened throughthe action of cam 16 when the drum D is in the position providing forfull speed forward operation of motor 11, and contacts 19 will only beopened through the action of projection 42 on disk 43 when apredetermined one of the compartment closures on cylinder 10 is in adefinite angular relation to the point at which it is desired to makethe initial or prime stop, namely, in registration with the tub door.When such conditions coincide contacts 1 7 and 19 will be opened,thereby effecting de-energization and opening of switch 1M to disconnectmotor 11 from the line; the aforedescribed energizing circuit of brakecoil B being simultaneously interrupted in an obvious manner to effectapplication of the brake.

Inasmuch as motor 11 is operating in a forward direction upon opening ofswitch 1M in the manner just described, it will be understood that thecontactor 34 of the'speed and direction responsive device is inengagement with contact 39. Hence upon reclosure of the normally closedauxiliary contacts 40 of switch 1M (auxiliary contacts 41 of switch 2Mbeing then in their normally closed position) an energizing circuit willbe completed for the winding of switch 3M, said circuit extending fromline L through switch 22, by conductors 79 and 80 through said auxiliarycontacts 40, conductor 81 through said winding, conductor 82 throughcontacts 41 and by conductor 83 through said contact 39 and contactor 34to line L Closure of contacts 3 and 3 of switch 3M thus completes theplugging connections formotor 11, re-

- sistances 1' 7' and r being included in the respective branches of themotor circuit. By the combined plugging and mechanical braking actionsmotor 11 is quickly brought to rest with the cylinder 10 in theaforementioned predetermined angular position; whereas upon a givenreduction in speed of motor 11 (and preferably just before the motorcomes to rest) the contactor 34 will be permitted to move automatically,under the action of its biasing means, to disengage the contact 39,whereby the reverse or plugging connections of the motor areinterrupted; said contactor 34 at the same time moving into engagementwith contact 35.

Let it be assumed that bythe aforedescribed prime or initial stop ofcylinder 10 one of the compartments is brought into so called loadingposition and in registration with the tub door. Thereupon the tub doormay be opened to effect opening. of contacts 12 and closure of contacts13, and the closure or door of the aforementioned registeringcompartment may be opened. It is then de- 'sired to move saidcompartment througha predetermined angle (say 50 degrees) to un-iloading position, and I have provided means for accomplishing thispurpose. It may be noted in this connection that the projection 44 onthe disk 45 and the projection 42 of disk 43 bear substantially the samerelation to the initial stopping position of the cylinder 10, and inview of the fact that there is comparativelylittle drift of motor 11during the stopping operation contacts 32 may be left in open positionthrough the action of projection 44 after the cylinder 10 is stopped.Moreover, it is extremely difficult to accurately adjust the variousprojections on disks 45 and 52 to insure reclosure of both sets ofcontacts 32 and 33 after each stop of the cylinder 10. However, due tore-engagement of contactor 34 with contact 35 of the speed responsivedevice each time the cylinder 10 is stopped, it will be seen that ashunt circuit around contacts 32 and 33 is provided, and henceopen'positioning of either of said sets of contacts will not interferewith the subsequent steps in the cycle of operation of the controlsystem.

Thus after the prime stop has been effected, the cylinder 10 may bemoved to the next position by momentary depression of push button switch29 to effect closure of the down contacts 31 of the latter; therebycompleting an energizing circuit for the winding of relay CR whichcircuit extends from line L through the contacts 13 (which are closeddue to opening of the tub door), by conductors 84 and 85 through saiddown contacts 31, conductors 86 and 87 through said winding, and byconductors 88 and 89 through contact 35 and contactor 34 to line LContacts 27 of relay CR in closing provide a maintaining circuit for thelatter, thereby permitting release of said push button switch 29. Uponreclosure of the up contacts 28 of push button switch 29 (thecontacts'30 of relay CR having been closed in the manner just described)an energizing circuit for the coil of brake B is likewise provided, saidcircuit extending from line L to conductor 84, as previously traced, byconductor 90 through contacts 27 of relay CR conductors 91 and 92through up contacts 28 of switch 29, conductors 93 and 94 throughcontacts 30 of relay CR and byconductor 95 through said brake coil toline L At the same time an energizing circuit. is completed for thewinding of switch 2M, said circuit extending from line L to conductor 93as just traced, and by conductor 96 through said winding to ,line LContacts 2 and 2 of switch 2M are thus closed to complete an energizingcircuit for motor 11 for operation of the latter in a forward direction,contacts 2 of switch 2M being simultaneously opened to insure againstshort circuiting o resistance 1' under these conditions. It will ofcourse be apparent to those skilled in the art that resistancescorresponding with resistance 7 might be 11 is thus restarted foroperation thereof in' a forward direction, the speed of the motor willcause disengagement of contactor 34 from contact 35 and engagement ofthe former with contact 39,during which time either of the switches 32or 33 (if open at the time the motor was started) will be reclosed. Theenergizing circuit of relay CR will therefore be maintained throughcontacts 32 and 33 pending movement of cylinder 10 through an angle ofabout 50 degrees from the point where the aforementioned prime stop waseffected. Thus if as heretofore assumed the switch 32 was opened throughthe actionof projection 44: on disk 45 at a time the prime stop ofcylinder 10 was effected, it will be understood that projection 51 willthen cause opening of contacts 33 when the cylinder has moved through anangle of about degrees to bring the aforementioned compartment tounloading position. When switch 33 is thus opened the relay CR isde-energized and the contacts 27 and 30 thereof open to efiectdeenergization of switch 2M for interrupting the motor circuitconnections, and to simultaneously de-energize the coil of brake Bwhereby the latter is applied.

Moreover, upon reclosure of the normally closed contacts 41 of switch2M, the aforedescribed energizing circuit'for the winding of switch 3Mis again completed,it being understood that under the conditions justdescribed auxiliary contacts 40 of switch 1M are closed and contactor34: is in engagement with contact 39 Under the aforedescribed mechanicalbraking and plugging action motor 11 is brought to a stop with its firstcompartment in unloading position,-' contactor 34 in the meantime havingbeen returned to its normalposition wherein it engages contact 35.

When the push button 29 is next momentarily depressed the aforedescribeddircuits are completed to eflect rotation of cylinder 10 through anangle of about 70 degrees to a point wherein the second compartment isin loading position whereupon the closure of said compartment is openedand button 29 is again depressed to move said compartment through about50 degrees to unloading position The next operation of button 29 resultsin movement of the third compartment-to loading position, and theclosure.

thereof is opened; whereupon button 29 is again depressed to causemovement of said com artment to unloadnig position As will be 0 vious,the next operation of button 29 7 results in movement of the firstcompartment to loading position, which is the position at which theprime stop was effected. After loading of the first compartment andclosure of the door thereof, button 29 is again temporarilydepressed tocause movement of said compartment to unloadin position; and immediatelyupon arrival 0 said compartment at the unloading position said buttonmay be again depressed to cause movement of the second compartment toloading position. The same procedure may be followed to bring the thirdcompartment'to loading position. Each of the compartments having beenloaded in the manner just described-and the respective doors thereofhaving been closed, it is obvious that upon reclosure of the tub doorswitch 12 will be reclosed thus initiating the cycle of operation in themanner'first mentioned.

While I have not described in detail each step in the operation of mycontroller, it is believed that the foregoing. description is sufficientto enable those skilled in the artto understand my invention and themode of applying the same for accomplishment of the novel resultsaforementioned.

It is to be understood that in practice the washer cylinder 10 and camdisks 45, 43 and 52 (Fig. 1) are preferably driven by motor 11 throughsuitable interposed reduc tion gearing.

What I claim as new and desire to secure by Letters Patent is:

1. In a controller for a motor driven rotatable device, the combinationwith means for effecting a prime stop of said device when the latter isin a predetermined angular position, of means thereafter operableindependently of said first mentioned means for efiecting stopping ofsaid device in other pre determined angular positions thereofsequenrection of rotation to efl'ect a prime stop of said device in apredetermined angular position of the latter, means operableindependently of said first mentioned means to thereafter directstopping'of said device in other predetermined. angular positionssequentially, and means operable automatically to render said lastmentioned means inefiective for stopping said device pending attainmentof a given speed of the latter. 7

3. In a controller for a motor driven rotatable device, the combinationwith means,

including a continuously operable control drum, for effecting periodicreversals of rotation of said device, means to direct stopping of thedevice, means sub ect to coincident predetermined conditions of speed,an-

gular position and only one direction of rotation of said device toeffect a prime stop of the latter in a predetermined angular position,means operable independently of said first mentioned means to thereaftereffect operation of said device and to direct stopping p thereof in aplurality of other predetermined angular opsitions sequentially, saidlast mentioned means comprising a limit switch, and means comprising aswitch operable independently of said limit switch after each stoppingoperation to temporarily render said limit switch ineffective forstopping said device.

4. In a controller for a motor driven rotatable device, the combinationwith means including a continuously operable control drum, for effectingperiodic reversals of rotation of said device, means to direct stoppingof the device, means subject to coincident predetermined conditions ofspeed, angular position and only one direction of rotation of saiddevice to effect a prime stop of the latter in a predetermined angularposition, means operable independently of said first mentioned means tothereafter effectoperation of said device and-to direct stopping thereofin a plurality of other predetermined angular positions sequentially,said last mentioned means comprising a limit switch, and meanscomprising a switch operable independently of said limit switch aftereach stopping operation to temporarily render said limit switchineffective for stopping said device, said last mentioned switch eingalso operable automatically in response to a given speed of the deviceto render said limit switch effective.

5. In a controller for a motor driven device, in combination,continuously operable means normally adapted to effect periodicreversals of rotation of said device, means to direct stopping of saiddevice, means for rendering said last mentioned means ineffective forstopping said device pending predetermined conditions of angularposition and only one direction of rotation of the latter, associatedmeans for thereafter effecting unidirectional rotation of said deviceand stopping thereof, in a plurality of other predetermined angularpositions sequentially, said last mentioned means comprising a limitswitch, a normally open push button switch in series with said limitswitch, and a normally closed switch in parallel with the latter, saidlast mentioned switch being operable in response to a given speed ofrotation of said device to render said limit switch effective forstopping the latter.

6. In a controller for a motor driven rotatable device, the combinationwith meansfor completin the motor circuit for effecting rotation of saiddevice, said means comprising a switch normally biased to closedosition, and a limit switch operable by sai device, said limit switchbeing connected in parallel with said first mentioned switch and tendingto interrupt the motor circuit upon rotation of said device to each of aplurality of angular positions sequentially, said first mentioned switchbeing operable automatically in response to a predetermined speed anddirection of rotation of said device to render said limit switchefiective for interrupting said circuit.

7. In a controller for a motor driven rotatable device, the combinationwith means for completing the motor circuit for effecting rotation ofsaid device, said means comprising a switch normally biased to closedposition, a limit switch operable by said device, said limit switchbeing connected in parallel with said first mentioned switch and tendingto interrupt the motor circuit upon rotation of said device to any oneof a numberpf predetermined angular positions, and means operableautomatically in response to a given speed of said device to effectopening of said first mentioned switch whereby said limit switch isrendered effective for interrupting said motor circuit.

8. In a controller for a motor driven rotatable device, the combinationwith means for tioned switch'being operab e automatically in response toa predetermined speed of rotation of said device to render said limitswitch effective for interrupting said circuit.

9. In a motor operated washing machine, in combination, a rotatingcylinder having a plurality of circumferentially arranged compartments,manually controllable means actuated by the machine durin the washingoperation for automatically e ecting a prime stop of said cylinder in apredetermined angular position of the latter, associated means forthereafter effecting operation of said device under insured conditionsof unidirectional rotation thereof and for effecting stopping of saiddevice in a plurality of other predetermined angular positions of thelatter, said last mentioned means comprising a limit switch operablewith said device, a normally open push button switch in series with saidlimit switch, and a normally closed switch in parallel with the latterwhereby said push button switch is rendered effective for initiatingoperation of said device independently of said limit switch, saidnormally closed switch being adapted to open in response to a givenspeed of operation of said device whereby tending to efiect stopping ofsaid motor by plugging, manually controllable means operable afterinitial stopping of said motor to eiiect operation of the latterindependently of said reversing means, said manually controllable meansincluding a normally open push button switch, a limit switch in serieswith said push button switch, and a speed responsive device havingnormally closed contacts in parallel with said limit switch whereby saidpush button switch is rendered efiective for initiating operation ofsaid motor independently of said limit switch, said device beingoperable to open its normally closed contacts in response to a givenspeed of said motorwhereby said limit switch is rendered effective forstopping the latter in the next succeeding predetermined angularposition of said cylinder.

11. In a motor operated washing machine, in combination, a washercylinder having a plurality of circumferentially arrangedcompartments,'an electric motor for rotatably driving said cylinder,continuously operable means normally adapted to efiect periodicreversals of rotation of said motor, means for directing stopping ofsaid motor, meansfor rendering said last mentioned means inefiective forstopping pending coincident predetermined conditions of angular positionand speed of rotation of said cylinder in'one direction, said stoppingmeans including electromechanical braking means and means tending toefiect stopping of said motor by plugging, manually controllable meansoperable after initial stopping of said motorto effect operation of thelatter independently of said reversing means, said manually controllablemeans including a normally open push button switch, a limit switch inseries with said push button switch, and a speed responsive devicehaving normally closed contacts in parallel with said limit switch, saiddevice being operable to open its normally closed contacts in responseto. a

given speed of said motor whereby said limit switch is renderedefifective for stopping the latter in the next succeeding predeterminedangular position of said cylinder, said electromechanical braking meansand said plugging means being utilized for such stopping.

In witness whereof, I have hereunto subscribed my name.

RALPH G. LOCKETT.

